METHOD OF PRODUCING SODIUM ARSENATE Russian patent published in 2012 - IPC C01G28/02 C25B1/14 

FIELD: chemistry.

SUBSTANCE: method of producing sodium arsenate involves electrolysis of water-alkaline solutions. Iron (III) hydroxide undergoes electrodialysis separation from sodium arsenate and arsenite, and spent iron hydroxide, which contains sodium arsenate and arsenite, is treated with 0.5 n Na₂CO₃ solution. The anode chamber is filled with 0.01 n sodium hydroxide solution and current density is set at 0.069 A/cm². The process takes place in a double-chamber electrolysis cell with an anion exchange membrane for 1.5 hours.

EFFECT: invention simplifies the process of obtaining sodium arsenate, increases purity of the obtained product based on non-waste technology owing to recycling of arsenic from spent iron hydroxide residue.

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